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Abstract: Cd(II)-imprinted silica was prepared by hydrothermal-assisted surface imprinting technique using Cd(II) as the template, with (3-mercaptopropyl) trimethoxysilane functionalized the surface of silica as a potential sorbent for the selective adsorption Cd(II), and characterized by FT-IR, SEM and TGA-DTA. The adsorption property and selective recognition ability of Cd(II)-imprinted silica were studied by equilibrium-adsorption method. The results showed that the maximum static adsorption capacities of imprinted and non-imprinted silica were 42.5 and 22.1 mg/g, respectively. The experimental data followed the Langmuir adsorption model. The adsorption equilibrium could be reached in 20 min. Kinetic studies indicated that the adsorption followed a pseudo-second-order model. There was no influence of pH values on adsorption capacity of imprinted silica in the range of 4-8. Imprinted silica could be used repeatedly and indicated high selectivity even in the presence of the other metal ions
Template and target information: cadmium ion, Cd(II)
Author keywords: (3-mercaptopropyl)trimethoxysilane, adsorption, cadmium, Hydrothermal-assisted, Ion imprinted